/Engine/Source/Editor/BlueprintGraph/Classes/EdGraphSchema_K2.h
When dragging off a pin, we want to duck the alpha of some nodes
virtual bool FadeNodeWhenDraggingOffPin ( const [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * Node, const [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * Pin ) const